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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88e48038f5b64b9ddc0a2ac22c779bcbd9560a915804030645d82f70c9e440c' 
  AND token = 'H1GHkDKArXEgdMp7p4+qgWRv0yT5FePPihAVrRDvFmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}